Quote:
Originally Posted by Jaden
What are your final power goals?
If you're doing a compound boost versus a take over, you need to be aware that the turbo will need to be capable of providing the airflow you need at the boost levels that the turbo alone will be running at.
So for instance if you're running the supercharger at 9 psi and want a final boost level of 24 psi, let's say, the turbo will max at about 10 psi, so if you want a top end power level of say 500hp, then you need a turbo that can push 50lbs/min at 10 psi. a GTX 3076r doesn't provide enough air at that level.
The reason a lot of people don't compound boost is that you'd have better top end power by using a turbo alone. With a smaller displacement engine like a 2.0l though the torque curve is so much better that it becomes well worth it if you get it working right and size the turbo appropriately.
Jaden
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That is actually what I found out/realized as I looked more into it. Neither of the Australian built Twin-Charged cars ever posted numbers, but I was talking to someone this weekend about them and said they never made over 350whp on the twin charge set-up. The company I was talking to was running a GT35R (even larger now) on their set-up, but no numbers were mentioned either. So I have started looking at a Sprintex 335 and a GTX3576R or slightly larger. Now that I know where to look, I can size a turbo for the set-up.
I was wanting somewhere in the mid 400s on a low setting and close to 600 on a high setting, but it looks like I may not have THAT much control over boost, due to the way the system works. I want a highish power level, with a great torque curve that starts low in the RPM range.
It seems I may just have to live with the GTX3076R and possibly buy a new twin scroll manifold to get a better low end.